Beam-compass.



G. 3. HILL.

BEAM COMPASS.

APPLICATION FILED JULY 191s,

1,288,4 1 2 Patented Dec. 17, 1918.

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GILBERT J. HILL, on NEW YORK, N. Y.

BEAM-COMPASS.

To all whom it may concern.-

of New York, have invented certain new and useful Improvements inBeam-Compasses, of which the following is a speclfication.

This invention relates to beam compasses.

1 More particularly, itbelongs intheclass with those drawing implementsof like general" structure, which are intended to inscribecircumferential curved lines, or to be employed as a measure, or as astraight line ruler, or for gaging the thickness of a body or itsdiametrical measure.

The object of this invention is the production of an instrument fallingwithin the classor type stated, of which the combined parts are ofspecial construction and are arranged in a particular manner one withregard to another. It is intended that this invention shall bemanufactured in such size as to be easily carried in the pocket, and itis believed that the peculiar structure hereinafter described andillustrated in the accompanying drawings makes a strong, durable,accurate and convenient appliance for the purposes sought.

Of the drawings, Figure 1 represents a side view of all the partsassembled, showing the invention ready for use with a lead pencil. Fig.2 is a top plan View of the parts shown in Fig. 1. Fig. 3 is a side viewof this invention showing all parts assembled, and having an ordinarydrawing pen held in the pencil holder. Fig. a is a vertical section ofthe movable beam in its holder, the section being taken upon the line Hof. Fig. 2.

Throughout the following description and the drawings the same letter isemployed to refer to the same part.

Considering the drawings, it will be noted that the beam A has asemicylindrical, hollow raised portion a running lengthwise along themiddle of the beam. This raised portion not only stiii'ens the beam, butit has another function of resisting any side wise displacement of thebeam, as will be further explained. At one end the beam has thetransverse pencil holder B, which contains the pencil b in Fig. 1.

The member for holding the graduated beam A and for guiding the samewhen moved lengthwise, comprises several features. It has a downwardlyextending por-' Specification of Letters Patent.

Patented Dec. 17, 1918.

Application filed. July 1, 1918. Serial No. 242,766.

tion orleg C, a body portion of which the side edges D and d are' turnedover and inwardly leaving a longitudinal space beeween them, acylindrical, knurled finger piece E projecting upwardly from the holder,and a set-screw socket c for the usual 1 needle point F.

hile this invention as illustrated in Fig. 1 shows a lead pencil bappliedthereto, an ordinary drawing pen G may be held in the holder B,by the simple expedient of Wrapping a strip of paper g around the lowerpart of the pen until the cylinder thus formed is suiiicient to beproperly grasped by the elastic sides or fingers of the pencil holder B.Other means of holding the pen may clearly be employed.

In explaining the operation of this invention, attention is called tothe fact that the inwardly turned edges 1) and d of the beam holderengage the side edges of the beam A. The beam is in that manner guidedin its movement lengthwise, and it is additionally held against lateraldisplacement by the arrangement of the hollow raised portion a of thebeam between the inwardly turned edges of the beam holder. It will beobserved also that the needle point F is alined with the edge of theholder that lies transversely upon the beam and acts as a pointer uponthe beam, enabling the user to ascertain the measure of the radius ofthe circle to be described, and indicated by the figures upon the beam.The beam illustrated is graduated in inches, but, any unit of measuremay obviously be used on either side, or upon both sides, of the beam A.

Considering Fig. 2, it will be noted that i the finger piece E and thepencil holder B project mostly upon one side of the holder and beam.That construction permits this invention to lie flat upon any surface,in order that a straight line may be drawn along the beam, whensufficiently exposed for the purpose or along the edge I) of the beamholder. The thickness of an object, or the diameter of a round body, maybe measured by placing the same between the finger piece E and thepencil holder B, as will be readily understood.

Having now described this invention, and explained the mode of itsoperation, what I claim is 1. In a beam compass, the combination with abody portion, of a longitudinally movable beam, the said body portionhaving projecting side edges arranged contiguous to the side edges ofthe beam for guiding the movement of the beam longitudinally, and thesaid beam having a raised middle portion extending for a distancelengthwise of the beam and in movable contact with the said edges of thebody portion whereby latoral movements of the beam are prevented.

In a beam compass, the combination with a beam holder having its edgesturned inwardly leaving a space lengthwise between them, of a graduatedbeam having its side edges in engagement with the said inwardly turnededges of the holder, the said beam having araised portion extendinglengthwise thereof and movably fitting the Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

said space between the said inwardly turned edges of the said holder ofthe beam.

3. In a beam compass, the combination with a beam holder having itsedges turned inwardly leaving a space lengthwise between them, of agraduated beam having its side edges in engagement with the saidinwardly turned edges of the holder, the said beam having a hollowraised portion ex- I tending longitudinally of the middle of the beamand movably fitting the said space between the said inwardly turnededges of the said holder of the beam.

In testimony whereof I aflix my signature.

GILBERT J. HILL.

Washington, D. G.

